In fact Sally Ann Howes, unlike Marianne McAndrew, could have done her own singing as Irene Malloy and would have been a treat in the role.
Debbie Reynolds would have been fun ten years later as Dolly - she still read too young and ingenue on film to do Dolly in 1969. Debbie might have been another Irene Malloy in 1969 and the ideal Minnie Fay in 1954.